[CRYPTO] api: Proc functions should be marked as unused

The proc functions were incorrectly marked as used rather than unused.
They may be unused if proc is disabled.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index b5befe8..bf45917 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -386,7 +386,7 @@
 }
 
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
-	__attribute_used__;
+	__attribute__ ((unused));
 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
 {
 	seq_printf(m, "type         : blkcipher\n");